Shaw Mountain Formation - basal volcaniclastic and metasedimentary member (VTScv;0)

Shaw Mountain Formation - basal volcaniclastic and metasedimentary member

Heterogeneous, thin (<10 m thick) unit of interbedded quartzite, amphibolite, felsic granofels, and phyllite, occurring at the base of the Waits River Formation on the north end of the Chester dome. Interpreted as recycled volcaniclastic rocks derived from the underlying volcanic and intrusive rocks in the Cram Hill Formation. Part of the Connecticut Valley Trough.

State	Vermont
Name	Shaw Mountain Formation - basal volcaniclastic and metasedimentary member
Geologic age	Upper to Lower Silurian
Lithologic constituents	Major Metamorphic > Amphibolite Metamorphic > Granoblastic > Granofels Metamorphic > Metasedimentary > Metaclastic > Quartzite Minor Metamorphic > Metasedimentary > Metaclastic > Phyllite
References	Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000. https://pubs.er.usgs.gov/publication/sim3184
NGMDB product	NGMDB product page for 96860
Counties	Windsor

Shaw Mountain Formation - basal volcaniclastic and metasedimentary member

Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.